function ContentEntityBase::__clone

Magic method: Implements a deep clone.

File

core/lib/Drupal/Core/Entity/ContentEntityBase.php, line 1160

Class

ContentEntityBase

Implements Entity Field API specific enhancements to the Entity class.

Namespace

Code

public function __clone() {
    // Avoid deep-cloning when we are initializing a translation object, since
    // it will represent the same entity, only with a different active language.
    if ($this->translationInitialize) {
        return;
    }
    // The translation is a different object, and needs its own TypedData
    // adapter object.
    $this->typedData = NULL;
    $definitions = $this->getFieldDefinitions();
    // The translation cache has to be cleared before cloning the fields
    // below so that the call to getTranslation() does not re-use the
    // translation objects of the old entity but instead creates new
    // translation objects from the newly cloned entity. Otherwise the newly
    // cloned field item lists would hold references to the old translation
    // objects in their $parent property after the call to setContext().
    $this->clearTranslationCache();
    // Because the new translation objects that are created below are
    // themselves created by *cloning* the newly cloned entity we need to
    // make sure that the references to property values are properly cloned
    // before cloning the fields. Otherwise calling
    // $items->getEntity()->isNew(), for example, would return the
    // $enforceIsNew value of the old entity.
    // Ensure the translations array is actually cloned by overwriting the
    // original reference with one pointing to a copy of the array.
    $translations = $this->translations;
    $this->translations =& $translations;
    // Ensure that the following properties are actually cloned by
    // overwriting the original references with ones pointing to copies of
    // them: enforceIsNew, newRevision, loadedRevisionId, fields, entityKeys,
    // translatableEntityKeys, values, isDefaultRevision and
    // enforceRevisionTranslationAffected.
    $enforce_is_new = $this->enforceIsNew;
    $this->enforceIsNew =& $enforce_is_new;
    $new_revision = $this->newRevision;
    $this->newRevision =& $new_revision;
    $original_revision_id = $this->loadedRevisionId;
    $this->loadedRevisionId =& $original_revision_id;
    $fields = $this->fields;
    $this->fields =& $fields;
    $entity_keys = $this->entityKeys;
    $this->entityKeys =& $entity_keys;
    $translatable_entity_keys = $this->translatableEntityKeys;
    $this->translatableEntityKeys =& $translatable_entity_keys;
    $values = $this->values;
    $this->values =& $values;
    $default_revision = $this->isDefaultRevision;
    $this->isDefaultRevision =& $default_revision;
    $is_revision_translation_affected_enforced = $this->enforceRevisionTranslationAffected;
    $this->enforceRevisionTranslationAffected =& $is_revision_translation_affected_enforced;
    $is_syncing = $this->isSyncing;
    $this->isSyncing =& $is_syncing;
    foreach ($this->fields as $name => $fields_by_langcode) {
        $this->fields[$name] = [];
        // Untranslatable fields may have multiple references for the same field
        // object keyed by language. To avoid creating different field objects
        // we retain just the original value, as references will be recreated
        // later as needed.
        if (!$definitions[$name]->isTranslatable() && count($fields_by_langcode) > 1) {
            $fields_by_langcode = array_intersect_key($fields_by_langcode, [
                LanguageInterface::LANGCODE_DEFAULT => TRUE,
            ]);
        }
        foreach ($fields_by_langcode as $langcode => $items) {
            $this->fields[$name][$langcode] = clone $items;
            $this->fields[$name][$langcode]
                ->setContext($name, $this->getTranslation($langcode)
                ->getTypedData());
        }
    }
}